JP4378030B2 - Tunnel underground bonding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground bonding method of the tunnel to complete the tunnel by drilling each tunnel using two shield machine facing each other, joining the respective tunnel in the middle.
[0002]
[Prior art]
Conventionally, a tunnel described in Japanese Patent Publication No. 5-24319 is known as an underground joint method for joining tunnels excavated by two shield machines. In the underground joining method described in this publication, the retracting side shield machine has a structure having a hood that can slide back and forth on the outer peripheral surface of the outer shell. The cutter head supported by the support structure and the hood are advanced in a state in which the cutter head is stopped, and then the hood is fixed and the bolt that fixes the hood to the support structure is removed to support the cutter head. At the same time, a procedure is adopted in which a compartment is formed in the hood by retreating.
[0003]
However, in the case of this underground bonding method, since the hood cannot be operated alone, the outer digging portion of the cutter head cannot be covered by this hood, and when the support structure is moved backward, There is a problem that there is a risk of collapse of natural ground.
[0004]
In order to solve such a problem, the body of the shield machine is advanced to a position covering the outer periphery of the cutter head prior to sliding the drive ring garter having the cutter head backward. An intermediate joining method is proposed in Japanese Patent No. 2915843.
[0005]
Another prior art is described in Japanese Patent Laid-Open No. 10-292775. In the shield machine described in this publication, a penetrating ring is provided on the inner peripheral surface of the front part of the airframe, and the penetrating ring is pushed forward by a shield jack so as to protrude forward of the airframe.
[0006]
[Problems to be solved by the invention]
However, in the underground joining method described in the above-mentioned Japanese Patent No. 2915843, since the drive part ring garter is configured to slide with respect to the front trunk, the drive part ring garter and the front trunk are usually connected during excavation. There is a problem that it is necessary to fix with a very strong connecting member (rolling stop), and it takes time and effort to remove the connecting member during underground bonding.
[0007]
On the other hand, in the underground bonding method described in Japanese Patent Laid-Open No. 10-291775, there is a problem in that the structure of both the drawing-side shield machine and the insertion-side shield machine is complicated. There is a problem that a storage space for the penetrating ring is required on the inner peripheral portion, and the amount of overcut becomes large.
[0008]
The present invention has been made to solve such problems, and it is not necessary to attach or remove the connecting member for stopping rolling, and it is possible to easily perform underground joining work, and to make the airframe extremely simple. It is an object of the present invention to provide a tunnel underground joint method that can be made into a simple structure.
[0009]
[Means for solving the problems and actions / effects]
In order to achieve the above object, the tunnel underground joint method according to the present invention comprises:
A first shield machine in which a front cylinder having a cutter head at the front is slidably fitted to the rear cylinder, and a second cylinder having a cylinder having the same diameter as the front cylinder of the first shield machine. Tunnel excavation using a shield machine and each tunnel is joined in the middle to complete the tunnel.
(A) a first step of fixing the front cylinder of the first shield machine to the segment and the rear cylinder via a shield jack, and removing a fixing member fixing the front cylinder and the rear cylinder;
(B) a second step of advancing the front cylinder by a predetermined distance relative to the rear cylinder by operating the shield jack;
(C) a third step of pushing the hood portion provided at the front portion of the front barrel forward to a position covering the outer periphery of the cutter head with respect to the front barrel;
(D) a fourth step of sliding the front barrel backward relative to the rear barrel by operating the shield jack while pushing the hood portion forward; and (e) the interior of the front barrel of the first shield machine. And a fifth step of fitting the cutter head of the second shield machine.
[0010]
In the underground joint method for a tunnel according to the present invention, when the first shield machine and the second shield machine are jointed in the ground, first, the front shell of the first shield machine is segmented via the shield jack in the first step. The fixing member (for example, a joining bolt) that fixes the front cylinder and the rear cylinder is removed, and the front cylinder can move with respect to the rear cylinder. Next, in the second step, the front barrel is advanced by a predetermined distance with respect to the rear barrel by the operation of the shield jack, and in the third step, the hood portion provided at the front portion of the front barrel is moved to the front barrel by the cutter head. Pushed forward to a position covering the outer periphery. Thereafter, while pushing the hood portion forward in the fourth step, the front barrel is slid backward with respect to the rear barrel by the operation of the shield jack, and the second shield digging is made inside the front barrel of the first shield machine. A receiving part of the machine is secured, and the cutter head of the second shield machine is fitted into the secured receiving part in the fifth step. In this way, the required part is water-stopped to complete the underground tunnel junction.
[0011]
According to the present invention, in the first shield machine, the hood portion provided at the front part of the front cylinder is a cutter head with respect to the front cylinder before the front cylinder slides backward with respect to the rear cylinder. Since it is pushed forward to the position covering the outer periphery of the front, it is possible to reliably prevent the collapse of the natural ground that occurs when the front trunk, in other words, the cutter head slides backward. In addition, a structure in which a slidable hood is provided on the front cylinder and the front cylinder and the drive ring garter are always fixed, so rolling between the front cylinder and the drive ring garter There is no need to provide a connecting member for stopping. Therefore, the attaching / detaching operation of the connecting member is not required, and not only the underground joining operation is facilitated, but also the machine body can have a very simple structure.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, a specific embodiment of the tunnel underground bonding method according to the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a longitudinal sectional view of a shield machine (retraction-side shield machine) according to an embodiment of the present invention.
[0018]
In the present embodiment, the retracting side shield machine (first shield machine) A is configured such that the machine body is divided into a front trunk (front shield) 1 and a rear trunk (rear shield) 2. The front part of 1 is made into a stepped small diameter, and the drive part ring garter 3 is fixed to the inner peripheral part of the stepped part. A cutter head 5 is rotatably supported on the drive unit ring gutter 3 via a bearing 4, and the cutter head 5 receives a pinion and a ring gear by a hydraulic motor 6 attached to the driving unit ring gutter 3. It is rotationally driven through.
[0019]
The front plate of the cutter head 5 is provided with a center cutter 7 at the center and a plurality of cutter bits 8 radially from the center to the periphery, and a plurality of cutter bits 8 are provided at positions near the periphery. A number of overcutter devices 9 are provided so as to be able to protrude from the outer peripheral edge of the cutter head 5.
[0020]
A pressure chamber 11 is defined behind the cutter head 5 between the bulkhead 10, a mud feeding pipe 12 for feeding mud water into the pressure chamber 11, and the mud feeding pipe 12. The mud pipe 13 which discharges in the state which mixed the muddy water and excavated earth and sand which are sent by the is opened. The mud pipe 12 and the mud pipe 13 are connected by a bypass pipe 14 at the rear.
[0021]
The front cylinder 1 is fitted to the front end portion of the rear cylinder 2, and the rear end portion of the front cylinder 1 and the front end portion of the rear cylinder 2 are fixed to each other by a plurality of bolts 15 during normal digging. Further, as shown in FIG. 2 (XX sectional view of FIG. 1), a convex portion 16 extending in the front-rear direction is provided on the rear trunk 2 side, and the convex portion is provided on the front trunk 1 side. When the front cylinder 1 moves forward with respect to the rear cylinder 2 by the convex parts 16 and the concave parts 17, relative rotation (rolling) between the front cylinder 1 and the rear cylinder 2 occurs. It is to be prevented.
[0022]
Further, flange portions of a plurality of shield jacks 18 are fixed to the rear end portion of the front barrel 1, and the rod tip portions of the shield jacks 18 are brought into contact with the front end surface of the segment 19 to obtain a thrust reaction force. A spreader 20 is mounted.
[0023]
A ring-shaped hood portion 21 is disposed on the outer peripheral portion of the stepped portion of the front barrel 1 so that the outer peripheral surface of the hood portion 21 is substantially flush with the rear outer peripheral surface of the front barrel 1 during normal digging. The front end surface of the hood portion 21 is substantially flush with the front end surface of the front barrel 1. The hood portion 21 is arranged so as to be slidable forward with respect to the front barrel 1 by operating a large number of bean jacks 22 arranged along the inner peripheral surface of the front barrel 1.
[0024]
Next, the hood part sliding mechanism including the bean jack 22 will be described in more detail with reference to FIGS. A ring-shaped connecting rod 23 is connected to the rear end surface of the hood portion 21, and the connecting rod 23 is arranged so as to penetrate the step portion (vertical portion) of the front barrel 1. The rear end face is pressed by the bean jack 22 so that the hood portion 21 is advanced through the connecting rod 23. In addition, another connecting rod 23 is attached to the rear end of the connecting rod 23 by screwing or welding, and after the most advanced connecting rod 23 is pressed by the bean jack 22 for a certain stroke, the bean jack is used. 22 is contracted to form a gap behind the most advanced connecting rod 23, another connecting rod 23 is inserted into the gap and added, and the bean jack 22 is extended again to push out the connecting rod 23. The In this way, a predetermined number of connecting rods 23 are sequentially added, and the hood portion 21 advances by a predetermined stroke.
[0025]
On the other hand, as shown in FIG. 4, in the insertion side shield machine (second shield machine) B, the drive part ring gutter 31 slides in the front-rear direction on the front inner peripheral surface of the straight body type body part 30. The cutter head 33 is rotatably inserted into the drive unit ring garter 31 via a bearing 32 so as to be rotatably supported. Further, a plurality of over cutter devices 34 are provided at positions near the peripheral edge of the cutter head 33 so as to protrude from the outer peripheral edge of the cutter head 33. Furthermore, the drive part ring gutter 31 has one end pivotally attached to the rib on the trunk part 30 side and the other end to the trunk part 30 by a slide jack 35 pivotally attached to the drive part ring gutter 31. And is slid forward. In addition, the detailed description of the configuration and the like common to the drawing-in side shield machine will be omitted.
[0026]
Next, a tunnel underground junction procedure according to the present embodiment will be described with reference to FIGS.
[0027]
1) Underground joining procedure 1 (Fig. 5)
The insertion-side shield machine B reaches the joining point, and the drawing-side shield machine A reaches a position a predetermined distance (for example, 700 mm) before the joining point. In this state, the skin plate of the rear trunk 2 and the segment 19 in the lead-side shield machine A are fixed (fixed portion 40), and the spreader 20 and the segment 19 of the shield jack 18 are fixed (fixed portion 41).
[0028]
2) Underground joining procedure 2 (Fig. 6)
The bolt 15 which fixes the front trunk | drum 1 and the rear trunk | drum 2 of the drawing-in side shield machine A is removed. On the other hand, in the insertion side shield machine B, the overcutter device 34 of the cutter head 33 is reduced inward.
[0029]
3) Underground joining procedure 3 (Fig. 7)
In the draw side shield machine A, the front head 1 is propelled forward by the predetermined distance (for example, 700 mm) relative to the rear body 2 by rotating the cutter head 5 while extending the shield jack 18 (arrow P). At the time of digging of the drawing side shield machine A, the insertion side shield machine B is in a standby state. When the retracting side shield machine A is dug, the convex portion 16 on the rear barrel 2 side is fitted into the concave portion 17 on the front barrel 1 side, so that the relative rotation between the front barrel 1 and the rear barrel 2 is improved. Movement (rolling) is prevented.
[0030]
4) Underground joining procedure 4 (Fig. 8)
After the overcutter device 9 in the retracting side shield machine A is reduced, the hood part 21 is pushed out while successively connecting the connecting rods 23 to the rear end part of the hood part 21, and the front end surface of the hood part 21 is the cutter. The head 5 is advanced (arrow Q) until it is flush with the face plate of the head 5 (approximately 300 mm in the present embodiment).
[0031]
5) Underground joining procedure 5 (Fig. 9)
By retracting the shield jack 18 of the lead-side shield machine A, the front barrel 1 is moved backward by the predetermined distance (for example, 700 mm) with respect to the rear barrel 2, and at the same time, the hood portion 21 is moved forward by the predetermined distance (for example, 700 mm). . As a result, the front barrel 1, in other words, only the cutter head 5 is retracted by the predetermined distance while maintaining the position of the hood portion 21, and the insertion side shield machine B is received in front of the cutter head 5. A space will be formed. Here, in the case of a soft ground or a ground with a lot of groundwater, for example, high-concentration muddy water is injected into the space in front of the cutter head 5 at the same time as the cutter head 5 is retracted, and earth and sand are in that space. It is preferable not to enter.
[0032]
6) Underground joining procedure 6 (FIG. 10)
In the insertion-side shield machine B in a state where the drawing-side shield machine A is in a standby state, the shield jack 18A is extended while rotating the cutter head 33 so that a part of the outer ring of the cutter head 33 is drawn. Then, the slide jack 35 is extended to push out the drive unit ring gutter 31 (arrow R). As a result, the cutter heads 5 and 33 of both shield machines A and B are brought into the closest state.
[0033]
7) Underground joining procedure 7 (Fig. 11)
Each member is removed leaving only the skin plate of each of the drawing-side shield machine A and the insertion-side shield machine B, and the required locations (welded portions 42 to 49) are welded to complete the underground joining.
[0034]
FIG. 12 shows a lead-side shield machine according to another embodiment of the present invention, and FIG. 13 shows an insertion-side shield machine according to another embodiment.
[0035]
In the lead-side shield machine A ′ according to the present embodiment, the front barrel 1 ′ is divided into a front first barrel portion 51 and a rear second barrel portion 52 via a middle folding mechanism 50. The first body 51 and the second body 52 can be bent by expansion and contraction of the articulated jack 53. Other than this, there is basically no difference from the previous embodiment. Therefore, the same reference numerals are given to the portions common to the previous embodiment, and the detailed description thereof is omitted.
[0036]
According to such a structure of the retracting side shield machine A ′, the front cylinder 1 ′ moves forward with respect to the rear cylinder 2 at the time of normal excavation where the front cylinder 1 ′ and the rear cylinder 2 are excavated integrally and during underground bonding. Sometimes, the traveling direction of the first body part 51 can be controlled with respect to the second body part 52, so that the center alignment at the time of underground joining of both shield machines can be easily performed. Problems such as the occurrence of a twisting phenomenon can be solved.
[0037]
On the other hand, in the insertion-side shield machine B ′, the body 30 ′ is divided and formed into a front first body 61 and a rear second body 62 via the middle folding mechanism 60. The part 61 and the second body part 62 can be bent by the expansion and contraction of the articulated jack 63. Further, during normal excavation, the first body 61 and the drive unit ring gutter 31 are fixed to each other by bolts 64 or the like.
[0038]
In the insertion-side shield machine B ′ having such a configuration, curve construction is possible by controlling the traveling direction of the first body part 61 relative to the second body part 62 during normal excavation. Further, in the underground joining, the fixed state of the first body 61 and the drive part ring gutter 31 by the bolt 64 or the like is released, and the bent part of the first body 61 and the second body 62 is fixed. Thus, the drive part ring gutter 31 is advanced relative to the first body part 61 and the second body part 62. The drive ring garter 31 can be advanced using the articulated jack 63.
[0039]
In the above description, the mechanism using the bean jack 22 and the connecting rod 23 as the hood part sliding mechanism has been described. However, as another form of the hood part sliding mechanism, FIGS. As shown in the figure, the hood portion 21 ′ is formed in a substantially crank shape in cross section, and the rear portion of the hood portion 21 ′ is inserted in a piston shape into a hydraulic chamber 70 provided on the front barrel 1A side, and the hood portion 21 An embodiment in which a seal member 71 is inserted between the rear end portion and the inner wall of the hydraulic chamber 70 and hydraulic pressure is supplied from the pipe 72 into the hydraulic chamber 70 is also possible. In such a configuration, when the hydraulic pressure is supplied into the hydraulic chamber 70 through the pipe 72 from the state shown in (a), the hood portion 21 ′ is moved forward to a predetermined position in the forward direction as shown in (b). Can be moved.
[0040]
In the above description, as the rolling prevention mechanism for preventing the relative rotation (rolling) between the front cylinder and the rear cylinder, the rear cylinder-side convex part 16 and the front cylinder-side concave part 17 are fitted. However, an embodiment in which a concave portion is provided on the rear trunk side and a convex portion is provided on the front trunk side so that the concave portion and the convex portion are fitted to each other is also possible.
[0041]
In the present embodiment, the muddy water type shield machine has been described, but it goes without saying that the present invention can also be applied to a mud pressure type shield machine.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a shield machine (retraction-side shield machine) according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line XX in FIG.
FIGS. 3A and 3B are enlarged cross-sectional views showing an operation mode of the hood portion. FIGS.
FIG. 4 is a longitudinal sectional view of a shield machine (insertion-side shield machine) according to an embodiment of the present invention.
FIG. 5 is a diagram showing a tunnel underground junction procedure (1).
FIG. 6 is a diagram showing a tunnel underground junction procedure (2).
FIG. 7 is a diagram showing a tunnel underground junction procedure (3).
FIG. 8 is a diagram showing a tunnel underground junction procedure (4);
FIG. 9 is a diagram showing a tunnel underground junction procedure (5).
FIG. 10 is a diagram showing a tunnel underground junction procedure (6).
FIG. 11 is a diagram showing a tunnel underground junction procedure (7);
FIG. 12 is a longitudinal sectional view of a retracting side shield machine according to another embodiment.
FIG. 13 is a longitudinal sectional view of an insertion side shield machine according to another embodiment.
14 (a) and 14 (b) are views showing another embodiment of the hood portion sliding mechanism.
[Explanation of symbols]
A, A 'Lead-side shield machine (first shield machine)
B, B 'insertion side shield machine (second shield machine)
1, 1 ', 1A Front cylinder 2 Rear cylinder 3, 31 Drive unit ring garter 5, 33 Cutter head 9, 34 Overcutter device 15 Bolt 16 Protrusion part 17 Concave part 18, 18A Shield jack 19 Segment 20 Spreader 21, 21' Hood part 22 Bean jack 23 Connecting rod 30, 30 ′ Body 35 Slide jack 40, 41 Fixed portion 50, 60 Middle folding mechanism 51, 61 First body 52, 62 Second body 53, 63 Articulated jack 70 Hydraulic chamber

Claims (1)

A first shield machine having a front cylinder having a cutter head at the front is slidably fitted to the rear cylinder, and a second cylinder having a cylinder having substantially the same diameter as the front cylinder of the first shield machine. Tunnel excavation using a shield machine and each tunnel is joined in the middle to complete the tunnel.
(A) a first step of fixing the front cylinder of the first shield machine to the segment and the rear cylinder via a shield jack, and removing a fixing member fixing the front cylinder and the rear cylinder;
(B) a second step of advancing the front cylinder by a predetermined distance with respect to the rear cylinder by operating the shield jack;
(C) a third step of pushing the hood portion provided at the front part of the front cylinder forward to a position covering the outer periphery of the cutter head with respect to the front cylinder;
(D) a fourth step of sliding the front barrel backward with respect to the rear barrel by operating the shield jack while pushing the hood portion forward; and (e) the inside of the front barrel of the first shield machine. A tunnel submerged joining method characterized by comprising a fifth step of fitting a cutter head of the second shield machine.

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